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Hectorol is indicated for the treatment of secondary hyperparathyroidism in patients with Stage 3 or Stage 4 Chronic Kidney Disease (capsules) and in patients with Chronic Kidney Disease on dialysis (capsules and injection). Hectorol is contraindicated in patients with a tendency towards hypercalcemia or current evidence of vitamin D toxicity. Overdosage of any form of vitamin D is dangerous. Acute hypercalcemia may exacerbate tendencies for cardiac arrhythmias and seizures and may potentiate the action of digitalis drugs. Chronic hypercalcemia can lead to generalized vascular and soft tissue calcification. Pharmacologic doses of vitamin D and its derivatives should be withheld during Hectorol treatment to avoid possible additive effects and hypercalcemia. Magnesium-containing antacids and Hectorol should not be administered concomitantly. Adverse effects of Hectorol treatment are: hypercalcemia, hyperphosphatemia, hypercalciuria, and oversuppression of iPTH. Adverse events reported by ≥ 5% of the Hectorol-treated predialysis patients included: infection, chest pain, constipation, dyspepsia, anemia, dehydration, depression, hypertonia, insomnia, paresthesia, increased cough, dyspnea, and rhinitis. Adverse events reported by ≥ 5% of the Hectorol-treated dialysis patients included: headache, malaise, bradycardia, nausea/vomiting, edema, dizziness, dyspnea, and pruritus. See Hectorol Capsules Full Prescribing Information or Hectorol Injection Full Prescribing Information or call Genzyme Medical Information at 1-800-847-0069.